EP1619559A1 - Verfahren und Gerät zur Vermeidung einer Überhitzung einer Schmelzfixiereinheit - Google Patents

Verfahren und Gerät zur Vermeidung einer Überhitzung einer Schmelzfixiereinheit Download PDF

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Publication number
EP1619559A1
EP1619559A1 EP05254293A EP05254293A EP1619559A1 EP 1619559 A1 EP1619559 A1 EP 1619559A1 EP 05254293 A EP05254293 A EP 05254293A EP 05254293 A EP05254293 A EP 05254293A EP 1619559 A1 EP1619559 A1 EP 1619559A1
Authority
EP
European Patent Office
Prior art keywords
temperature
fuser assembly
print sheet
print
sheet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP05254293A
Other languages
English (en)
French (fr)
Other versions
EP1619559B1 (de
Inventor
Su-Kyoung Chae
Cheol-ju 934-1102 Taeyoung Apt. Yang
Jun-bae 106-2104 Taeyoung Dessian Apt. Jeon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung Electronics Co Ltd
Original Assignee
Samsung Electronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Publication of EP1619559A1 publication Critical patent/EP1619559A1/de
Application granted granted Critical
Publication of EP1619559B1 publication Critical patent/EP1619559B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/65—Apparatus which relate to the handling of copy material
    • G03G15/6555—Handling of sheet copy material taking place in a specific part of the copy material feeding path
    • G03G15/657—Feeding path after the transfer point and up to the fixing point, e.g. guides and feeding means for handling copy material carrying an unfused toner image
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
    • G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
    • G03G15/2014—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
    • G03G15/2039—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat with means for controlling the fixing temperature
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00367—The feeding path segment where particular handling of the copy medium occurs, segments being adjacent and non-overlapping. Each segment is identified by the most downstream point in the segment, so that for instance the segment labelled "Fixing device" is referring to the path between the "Transfer device" and the "Fixing device"
    • G03G2215/00413—Fixing device

Definitions

  • the present invention relates to image forming apparatus.
  • a fuser assembly typically includes a heating roller and a press roller, and is an apparatus that passes a print sheet having a toner thereon through space between the heating roller and the press roller to permanently fix the toner onto the print sheet by heat and pressure.
  • the heating roller generates heat of about 180°C.
  • the press roller is composed of a silicon rubber.
  • An exemplary press roller melts the toner particles stuck onto the print sheet by heat while applying a strong pressure toward the heating roller.
  • a thick rubber layer is used for the heating roller and the press roller of the fuser assembly to guarantee fixing the toner particles to the print sheet.
  • the response time is very long and thus the temperature of the fuser assembly rises for a while even when the heat supplied according to a temperature control is switched off.
  • the fuser assembly may be easily melted or deformed by the sudden rise of the temperature of the fuser assembly.
  • Preferred embodiments of the present invention aim to provide a method for preventing overheating of a fuser assembly to prevent deformation of the fuser assembly by forcing a print sheet to pass through the fuser assembly after a printing.
  • Preferred embodiments of the present invention further aim to provide an apparatus for preventing overheating of a fuser assembly in which the fuser assembly is prevented from being deformed by forcing a print sheet to pass through the fuser assembly after a printing.
  • a method of preventing overheating of a fuser assembly including inspecting whether a temperature of a fuser assembly is higher than a predetermined temperature, if the temperature of the fuser assembly is higher than the predetermined temperature it is determined whether there is a print command, a print sheet is passed through the fuser assembly, conveyed to a predetermined location, and again inspecting the temperature of the fuser assembly if there is no print command, if the temperature is lower than the predetermined temperature it is determined whether a predetermined time has lapsed, the temperature is inspected if the predetermined time does not lapse.
  • an apparatus for preventing overheating of a fuser assembly includes a fuser assembly temperature inspection unit for inspecting a temperature of the fuser assembly to determine if the temperature of the fuser assembly is higher than a predetermined temperature, a print command determining unit for determining whether there is a print command in response to an inspection result from the fuser assembly temperature inspection unit a print sheet convey processing unit for conveying the print sheet to a predetermined location after passing the print sheet through the fuser assembly in response to a determination result from the print command determining unit, a time lapse determining unit for determining whether a predetermined time lapses in response to the inspection result from the fuser assembly temperature inspection unit.
  • FIG. 1 is a flowchart of a method of preventing overheating of a fuser assembly according to an exemplary embodiment of the present invention.
  • FIG. 2 is a block diagram illustrating a device for preventing overheating of a fuser assembly according to an exemplary embodiment of the present invention.
  • FIG. 1 shows a flowchart describing a method of preventing overheating of a fuser assembly according to an exemplary embodiment of the present invention.
  • the method according to an exemplary embodiment of the present invention includes operations 10 through 20 in which a temperature of a fuser assembly is detected to determine whether the detected temperature is higher than a predetermined temperature and then a print sheet is passed through the fuser assembly to lower the high temperature.
  • the temperature of the fuser assembly is detected to determine whether the detected temperature is higher than a predetermined temperature (operation 10).
  • the predetermined temperature is set to a value at which the fuser assembly may be deformed.
  • a print sheet passes through the fuser assembly and then is conveyed to a predetermined location. Then, the process is returned to operation 10 (operation 14). If the fuser assembly remains in the overheated state, since the fuse assembly may be deformed, the temperature of the fuser assembly must be lowered. Therefore, in operation 14, a print sheet is provided to pass through the fuser assembly to lower the high temperature. By passing the print sheet through the fuser assembly, the print sheet takes the heat away from the fuser assembly.
  • the print sheet that has passed through the fuser assembly is conveyed to a predetermined location.
  • a predetermined location There may be two exemplary ways to convey the print sheet to the predetermined location.
  • the print sheet that has passed through the fuser assembly is conveyed to a sheet-feeding cassette. Even if the print sheet has passed through the fuser assembly, since the print sheet does not have printing data to be transferred and fixed thereon, the print sheet is collected in a sheet-feeding cassette, thereby allowing the print sheet to be reused for a next printing according to a print command.
  • the print sheet that has passed through the fuser assembly to lower the temperature is conveyed to a sheet-feeding standby location for a back-side printing in a duplex printing mode.
  • the print sheet that has passed through the fuser assembly to lower the temperature is conveyed to the sheet-feeding standby location to reuse it for a back-side printing according to a duplex printing process.
  • the print sheet that has passed through the fuser assembly to lower the temperature is conveyed to a predetermined location to reuse it, a print sheet that has not experienced a substantial printing is not allowed to be discharged outside the image forming apparatus.
  • the printing is performed according to the print command and the procedure is returned to operation 10 (operation 18).
  • the temperature of the fuser assembly must be maintained at least at a temperature for fusing toner to the print sheet even when the fuser assembly is overheated. Therefore, there is no need to lower the temperature of the fuser assembly. Furthermore, when the print sheet having a toner transferred thereon passes through the fuser assembly for a substantial printing, the temperature of the fuser assembly may be lowered to some extent.
  • the procedure is returned to operation 10 and then the above procedures are performed again. On the other hand, if the predetermined time has lapsed, then the above procedure is terminated, as shown in FIG. 1.
  • the method of preventing overheating of a fuser assembly according to the present invention is performed right after finishing the substantial printing. It is known that the temperature of the fuser assembly tends to constantly rise right after finishing the substantial printing. Therefore, by performing the method of preventing overheating of a fuser assembly according to an exemplary embodiment of the present invention, it is possible to prevent the fuser assembly from being deformed by the rising temperature.
  • FIG. 2 is a block diagram illustrating a device for preventing overheating of a fuser assembly according to an exemplary embodiment of the present invention.
  • the device according to this embodiment of the present invention includes a fuser assembly temperature inspection unit 100, a print command determining unit 110, a time lapse determining unit 120, a print sheet convey processing unit 130, an overheating preventive operation information storing unit 140, and a printing unit 150.
  • the fuser assembly temperature inspection unit 100 inspects the temperature of the fuser assembly (not shown in the drawing) to determine whether the temperature is higher than a predetermined temperature and outputs the inspection result to the print command determining unit 110 and the time lapse determining unit 120.
  • the predetermined temperature is previously set by the fuser assembly temperature inspection unit 100 and a high temperature at which the fuser assembly may be deformed.
  • the print command determining unit 110 determines whether there is a print command in response to the inspection result from the fuser assembly temperature inspection unit 100 and outputs the determination result to the print sheet convey processing unit 130 and the printing unit 150. If the print command determining unit 110 receives the inspection result indicating that the temperature of the fuser assembly is higher than the predetermined temperature from the fuser assembly temperature inspection unit 100, the print command determining unit 110 determines whether there is a print command for a printing from a user.
  • the time lapse determining unit 120 determines if a predetermined time lapses in response to the inspection result from the fuser assembly temperature inspection unit 100 and outputs the determination result back to the fuser assembly temperatu re inspection unit 100. If the time lapse determining unit 120 receives the determination result from the fuser assembly temperature inspection unit 100 indicating that the temperature of the fuser assembly is lower than the predetermined temperature, the time lapse determining unit 120 determines whether the predetermined time lapses after the inspection of the fuser assembly temperature inspection unit 100.
  • the print sheet convey processing unit 130 conveys the print sheet to a predetermined location after passing the print sheet through the fuser assembly in response to the determination result from the print command determining unit 110.
  • the predetermined location may be a sheet-feeding cassette or a sheet-feeding standby location for a back-side printing in a duplex printing mode.
  • the sheet-feeding standby location for a back-side printing in a duplex printing mode is a location where the print sheet stands by for a back-side printing according to a duplex printing process.
  • the print sheet convey processing unit 130 when the print sheet convey processing unit 130 receives the determination result from the print command determining unit 110 indicating that there is no print command, the print sheet convey processing unit 130 passes the print sheet through the fuser assembly to lower the temperature and then conveys the print sheet to the sheet-feeding cassette or to the sheet-feeding standby location for a back-side printing in a duplex printing mode.
  • the overheating preventive operation information storing unit 140 When the overheating preventive operation information storing unit 140 receives a result from the print sheet convey processing unit 130 indicating that the print sheet has been conveyed to the predetermined location, the overheating preventive operation information storing unit 140 stores information indicating that the overheating preventive operation has been performed by passing the print sheet through the fuser assembly. The stored result is output to the fuser assembly temperature inspection unit 100. According to a conventional apparatus, if the print sheet is not discharged outside the image forming apparatus after passing through the fuser assembly, the image forming apparatus recognizes it as a paper jamming and displays an error message. According to an exemplary embodiment of the present invention, to prevent such an error message from being displayed, the overheating preventive operation information storing unit 140 stores information indicating that the overheating preventive operation has been performed by passing the print sheet through the fuser assembly to lower the temperature.
  • the printing unit 150 When the printing unit 150 receives the determination result 110 from the print command determining unit indicating that there is a print command for a printing, the printing unit 150 performs a printing according to the print command and outputs the result to the fuser assembly temperature inspection unit 100.
  • the fuser assembly temperature inspection unit 100 When the fuser assembly temperature inspection unit 100 receives the result stored in the overheating preventive operation information storing unit 140 or the result from the printing unit 150, the fuser assembly temperature inspection unit 100 inspects whether the temperature of the fuser assembly is higher than the predetermined temperature again. The inspection result is output to the print command determining unit 110 and the time lapse determining unit 120.
  • the aforementioned operation of the apparatus for preventing overheating of a fuser assembly is initiated right after finishing the printing.
  • deformation caused by the overheating of the fuser assembly may be automatically prevented.
  • a method of preventing overheating of a fuser assembly provides advantages in that deformation of the fuser assembly caused by an abnormal high temperature may be prevented.
  • the high temperature of the fuser assembly is lowered by passing a print sheet through the fuser assembly to allow the print paper to take the heat away from the fuser assembly when it is detected that the temperature of the fuser assembly is higher than a predetermined temperature.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Fixing For Electrophotography (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
EP05254293A 2004-07-20 2005-07-08 Verfahren und Gerät zur Vermeidung einer Überhitzung einer Schmelzfixiereinheit Not-in-force EP1619559B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020040056420A KR100544206B1 (ko) 2004-07-20 2004-07-20 정착기의 과열 방지방법 및 장치

Publications (2)

Publication Number Publication Date
EP1619559A1 true EP1619559A1 (de) 2006-01-25
EP1619559B1 EP1619559B1 (de) 2007-08-22

Family

ID=34982069

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05254293A Not-in-force EP1619559B1 (de) 2004-07-20 2005-07-08 Verfahren und Gerät zur Vermeidung einer Überhitzung einer Schmelzfixiereinheit

Country Status (5)

Country Link
US (1) US7477855B2 (de)
EP (1) EP1619559B1 (de)
KR (1) KR100544206B1 (de)
CN (1) CN100444047C (de)
DE (1) DE602005002094T2 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7546051B2 (en) * 2007-04-17 2009-06-09 Kabushiki Kaisha Toshiba Fixing apparatus and image processing apparatus

Citations (2)

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Publication number Priority date Publication date Assignee Title
JP2001255782A (ja) * 2000-03-10 2001-09-21 Canon Inc 画像出力装置及びその制御方法
US20040042810A1 (en) * 2002-06-24 2004-03-04 Durk-Hyun Cho Method of controlling power of a fixing device of electro-photographic image forming apparatus in print standby mode

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JPS5238938A (en) * 1975-09-23 1977-03-25 Konishiroku Photo Ind Co Ltd Temperature control device for fixing means of electrophotographic cop ying machine
JPS58158671A (ja) * 1982-03-16 1983-09-20 Canon Inc 定着装置
JPS6419382A (en) * 1987-07-15 1989-01-23 Canon Kk Image forming device
JPH03181980A (ja) * 1989-12-11 1991-08-07 Canon Inc 定着装置
JPH03200275A (ja) * 1989-12-28 1991-09-02 Canon Inc 定着装置
JP3181980B2 (ja) * 1992-06-12 2001-07-03 株式会社リコー 光学エンコーダ用の円柱状スケールおよびその製造方法
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Publication number Priority date Publication date Assignee Title
JP2001255782A (ja) * 2000-03-10 2001-09-21 Canon Inc 画像出力装置及びその制御方法
US20040042810A1 (en) * 2002-06-24 2004-03-04 Durk-Hyun Cho Method of controlling power of a fixing device of electro-photographic image forming apparatus in print standby mode

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Also Published As

Publication number Publication date
US7477855B2 (en) 2009-01-13
DE602005002094T2 (de) 2008-05-21
DE602005002094D1 (de) 2007-10-04
KR100544206B1 (ko) 2006-01-23
US20060018675A1 (en) 2006-01-26
CN100444047C (zh) 2008-12-17
CN1725123A (zh) 2006-01-25
EP1619559B1 (de) 2007-08-22

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